<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title></title>

  </head>
  <script src="./lib/vue.js" charset="utf-8"></script>
  <body>
     <div class="box">
        <input type="text"  v-model="message">
        <span>{{message}}</span>

     </div>

  </body>

  <script type="text/javascript">
      let vm = new Vue({
        el:'.box',
        data:{
          message:''
        }
      });

  </script>
</html>
